1
|
Hegaard F, Thormann E. Influence of Ionic Strength and Specific Ion Effects on Polyelectrolyte Multilayer Films with pH-Responsive Behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:5012-5020. [PMID: 37000604 DOI: 10.1021/acs.langmuir.2c03515] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Layer-by-layer assembled multilayer films have shown great potential for different applications owing to their responsive behavior. Herein, we systematically investigated the effects of composition, salt concentration, and ion specificity on the pH responsiveness of covalently crosslinked chitosan and alginate dialdehyde multilayer films. The changes in film swelling were measured using ellipsometry from low (0.01 mM) to high (3 M) salt (NaCl or NaSCN) concentrations at pH 3, 6, and 9. The swelling responses to increasing ionic strength matched the swelling responses observed for polyzwitterionic and weak monocomponent polyelectrolyte films and depended on the multilayer composition, pH, and ion specificity. Finally, we used the ellipsometric data to demonstrate that the pH responsiveness of such multilayer films, as measured using a quartz crystal microbalance with dissipation monitoring, strongly depends on the ionic condition under which the responses were measured. We thus show that erroneous conclusions about the pH responsiveness of polyelectrolyte multilayer films can be easily obtained if the ionic environment of the application does not closely resemble the ionic condition under which the pH responsiveness is tested.
Collapse
Affiliation(s)
- Frederik Hegaard
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Esben Thormann
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| |
Collapse
|
2
|
Russo A, Schürmann H, Brandt M, Scholz K, Matos ALL, Grill D, Revenstorff J, Rembrink M, von Wulffen M, Fischer‐Riepe L, Hanley PJ, Häcker H, Prünster M, Sánchez‐Madrid F, Hermann S, Klotz L, Gerke V, Betz T, Vogl T, Roth J. Alarming and Calming: Opposing Roles of S100A8/S100A9 Dimers and Tetramers on Monocytes. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2201505. [PMID: 36310133 PMCID: PMC9798971 DOI: 10.1002/advs.202201505] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 09/30/2022] [Indexed: 05/16/2023]
Abstract
Mechanisms keeping leukocytes distant of local inflammatory processes in a resting state despite systemic release of inflammatory triggers are a pivotal requirement for avoidance of overwhelming inflammation but are ill defined. Dimers of the alarmin S100A8/S100A9 activate Toll-like receptor-4 (TLR4) but extracellular calcium concentrations induce S100A8/S100A9-tetramers preventing TLR4-binding and limiting their inflammatory activity. So far, only antimicrobial functions of released S100A8/S100A9-tetramers (calprotectin) are described. It is demonstrated that extracellular S100A8/S100A9 tetramers significantly dampen monocyte dynamics as adhesion, migration, and traction force generation in vitro and immigration of monocytes in a cutaneous granuloma model and inflammatory activity in a model of irritant contact dermatitis in vivo. Interestingly, these effects are not mediated by the well-known binding of S100A8/S100A9-dimers to TLR-4 but specifically mediated by S100A8/S100A9-tetramer interaction with CD69. Thus, the quaternary structure of these S100-proteins determines distinct and even antagonistic effects mediated by different receptors. As S100A8/S100A9 are released primarily as dimers and subsequently associate to tetramers in the high extracellular calcium milieu, the same molecules promote inflammation locally (S100-dimer/TLR4) but simultaneously protect the wider environment from overwhelming inflammation (S100-tetramer/CD69).
Collapse
Affiliation(s)
- Antonella Russo
- Institute of ImmunologyUniversity of Münster48149MünsterGermany
- Cells in Motion Interfaculty CentreUniversity of Münster48149MünsterGermany
| | - Hendrik Schürmann
- Institute of Cell BiologyCentre for Molecular Biology of InflammationZMBEUniversity of Münster48149MünsterGermany
| | - Matthias Brandt
- Institute of Cell BiologyCentre for Molecular Biology of InflammationZMBEUniversity of Münster48149MünsterGermany
| | - Katja Scholz
- Institute of ImmunologyUniversity of Münster48149MünsterGermany
| | - Anna Livia L. Matos
- Cells in Motion Interfaculty CentreUniversity of Münster48149MünsterGermany
- Institute of Medical BiochemistryCentre of Molecular Biology of InflammationZMBEUniversity of Münster48149MünsterGermany
| | - David Grill
- Institute of Medical BiochemistryCentre of Molecular Biology of InflammationZMBEUniversity of Münster48149MünsterGermany
| | | | | | | | | | - Peter J. Hanley
- Faculty of MedicineHMU Health and Medical University Potsdam14471PotsdamGermany
| | - Hans Häcker
- Department of PathologyDivision of Microbiology and ImmunologyUniversity of UtahSalt Lake CityUT84112USA
| | - Monika Prünster
- BioMedical CenterWalter‐Brendel‐Centre for Experimental MedicineLudwig‐Maximilians‐UniversityPlanegg‐Martinsried82152MunichGermany
| | - Francisco Sánchez‐Madrid
- Immunology ServiceHospital de la PrincesaUniversidad Autónoma de MadridInstituto Investigación Sanitaria PrincesaMadrid28006Spain
- Department of Vascular Biology and InflammationCentro Nacional de Investigaciones Cardiovasculares (CNIC)Madrid28029Spain
| | - Sven Hermann
- European Institute for Molecular Imaging (EIMI)University of Münster48149MünsterGermany
| | - Luisa Klotz
- Department of Neurology with Institute of Translational NeurologyUniversity Hospital Muenster48149MuensterGermany
| | - Volker Gerke
- Cells in Motion Interfaculty CentreUniversity of Münster48149MünsterGermany
- Institute of Medical BiochemistryCentre of Molecular Biology of InflammationZMBEUniversity of Münster48149MünsterGermany
| | - Timo Betz
- Cells in Motion Interfaculty CentreUniversity of Münster48149MünsterGermany
- Institute of Cell BiologyCentre for Molecular Biology of InflammationZMBEUniversity of Münster48149MünsterGermany
- Third Institute of Physics– BiophysicsGeorg August University Göttingen37077GöttingenGermany
| | - Thomas Vogl
- Institute of ImmunologyUniversity of Münster48149MünsterGermany
| | - Johannes Roth
- Institute of ImmunologyUniversity of Münster48149MünsterGermany
- Cells in Motion Interfaculty CentreUniversity of Münster48149MünsterGermany
| |
Collapse
|
3
|
Fraile S, Briones M, Revenga-Parra M, de Lorenzo V, Lorenzo E, Martínez-García E. Engineering Tropism of Pseudomonas putida toward Target Surfaces through Ectopic Display of Recombinant Nanobodies. ACS Synth Biol 2021; 10:2049-2059. [PMID: 34337948 PMCID: PMC8397431 DOI: 10.1021/acssynbio.1c00227] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Indexed: 12/15/2022]
Abstract
Gram-negative bacteria are endowed with complex outer membrane (OM) structures that allow them to both interact with other organisms and attach to different physical structures. However, the design of reliable bacterial coatings of solid surfaces is still a considerable challenge. In this work, we report that ectopic expression of a fibrinogen-specific nanobody on the envelope of Pseudomonas putida cells enables controllable formation of a bacterial monolayer strongly bound to an antigen-coated support. To this end, either the wild type or a surface-naked derivative of P. putida was engineered to express a hybrid between the β-barrel of an intimin-type autotransporter inserted in the outer membrane and a nanobody (VHH) moiety that targets fibrinogen as its cognate interaction partner. The functionality of the thereby presented VHH and the strength of the resulting cell attachment to a solid surface covered with the cognate antigen were tested and parametrized with Quartz Crystal Microbalance technology. The results not only demonstrated the value of using bacteria with reduced OM complexity for efficient display of artificial adhesins, but also the potential of this approach to engineer specific bacterial coverings of predetermined target surfaces.
Collapse
Affiliation(s)
- Sofía Fraile
- Systems Biology Department, Centro Nacional
de Biotecnología (CNB-CSIC), Campus de Cantoblanco, 28049 Madrid, Spain
| | - María Briones
- Departamento de Química Analítica y Análisis
Instrumental, Universidad Autónoma
de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain
| | - Mónica Revenga-Parra
- Departamento de Química Analítica y Análisis
Instrumental, Universidad Autónoma
de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain
| | - Víctor de Lorenzo
- Systems Biology Department, Centro Nacional
de Biotecnología (CNB-CSIC), Campus de Cantoblanco, 28049 Madrid, Spain
| | - Encarnación Lorenzo
- Departamento de Química Analítica y Análisis
Instrumental, Universidad Autónoma
de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain
| | - Esteban Martínez-García
- Systems Biology Department, Centro Nacional
de Biotecnología (CNB-CSIC), Campus de Cantoblanco, 28049 Madrid, Spain
| |
Collapse
|
4
|
Mottin D, Razan F, Nogues C, Jullien MC. Out-of-Equilibrium Measurements of Kinetic Constants on a Biosensor. Anal Chem 2021; 93:7266-7274. [PMID: 33960190 DOI: 10.1021/acs.analchem.1c00543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Conventional measurements of kinetic constants currently in use are performed at equilibrium and may require large volumes, especially at a low association rate constant kon. If the measurements are made out of equilibrium, the values obtained may be biased by dilution of the sample with the flow of the running buffer. In some applications, the available sample volume can be very critical and requires the development of tools to measure kinetic constants with low volumes. In this paper, by combining an experimental, numerical and modeling approach, we propose a surface plasmon resonance-based method that relies on an out-of-equilibrium measurement using the effect of dilution by flow to its advantage. This new method should have a significant impact in biochemistry and medical research.
Collapse
Affiliation(s)
- Donatien Mottin
- Université Rennes 1, CNRS, IPR (Institut de Physique de Rennes) UMR 6251, F-35000 Rennes, France.,ENS Rennes, SATIE, UMR-CNRS 8029, Campus de Ker Lann, F-35170 Bruz, France
| | - Florence Razan
- ENS Rennes, SATIE, UMR-CNRS 8029, Campus de Ker Lann, F-35170 Bruz, France
| | - Claude Nogues
- ENS Paris-Saclay, LBPA UMR-CNRS 8113, 91190 Gif-sur-Yvette, France
| | - Marie-Caroline Jullien
- Université Rennes 1, CNRS, IPR (Institut de Physique de Rennes) UMR 6251, F-35000 Rennes, France
| |
Collapse
|
5
|
Kartanas T, Levin A, Toprakcioglu Z, Scheidt T, Hakala TA, Charmet J, Knowles TPJ. Label-Free Protein Analysis Using Liquid Chromatography with Gravimetric Detection. Anal Chem 2021; 93:2848-2853. [PMID: 33507064 DOI: 10.1021/acs.analchem.0c04149] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The detection and analysis of proteins in a label-free manner under native solution conditions is an increasingly important objective in analytical bioscience platform development. Common approaches to detect native proteins in solution often require specific labels to enhance sensitivity. Dry mass sensing approaches, by contrast, using mechanical resonators, can operate in a label-free manner and offer attractive sensitivity. However, such approaches typically suffer from a lack of analyte selectivity as the interface between standard protein separation techniques and micro-resonator platforms is often constrained by qualitative mechanical sensor performance in the liquid phase. Here, we describe a strategy that overcomes this limitation by coupling liquid chromatography with a quartz crystal microbalance (QCM) platform by using a microfluidic spray dryer. We explore a strategy which allows first to separate a protein mixture in a physiological buffer solution using size exclusion chromatography, permitting specific protein fractions to be selected, desalted, and subsequently spray-dried onto the QCM for absolute mass analysis. By establishing a continuous flow interface between the chromatography column and the spray device via a flow splitter, simultaneous protein mass detection and sample fractionation is achieved, with sensitivity down to a 100 μg/mL limit of detection. This approach for quantitative label-free protein mixture analysis offers the potential for detection of protein species under physiological conditions.
Collapse
Affiliation(s)
- Tadas Kartanas
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Aviad Levin
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Zenon Toprakcioglu
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Tom Scheidt
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Tuuli A Hakala
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Jerome Charmet
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.,WMG, University of Warwick, Coventry CV4 7AL, U.K
| | - Tuomas P J Knowles
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.,Cavendish Laboratory, University of Cambridge, Cambridge CB3 0FE, U.K
| |
Collapse
|
6
|
Jiang T, Moghaddam SZ, Thormann E. A pH-responsive polyelectrolyte multilayer film with tunable interfacial properties. POLYMER 2021. [DOI: 10.1016/j.polymer.2020.123367] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
7
|
Herzberg M, Larsen AS, Hassenkam T, Madsen AØ, Rantanen J. In situ nanoscale visualization of solvent effects on molecular crystal surfaces. CrystEngComm 2021. [DOI: 10.1039/d1ce00209k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Atomic force microscopy and molecular dynamics simulations probed the crystallinity and hydrophobicity of a paracetamol crystal surface in water–ethanol mixtures. We observe the formation of a dynamic heterogenous disordered surface (DHDS) layer.
Collapse
Affiliation(s)
- Mikkel Herzberg
- Department of Pharmacy
- University of Copenhagen
- 2100 Copenhagen
- Denmark
| | - Anders S. Larsen
- Department of Pharmacy
- University of Copenhagen
- 2100 Copenhagen
- Denmark
| | - Tue Hassenkam
- Globe Institute
- University of Copenhagen
- 1350 Copenhagen
- Denmark
| | - Anders Ø. Madsen
- Department of Pharmacy
- University of Copenhagen
- 2100 Copenhagen
- Denmark
| | - Jukka Rantanen
- Department of Pharmacy
- University of Copenhagen
- 2100 Copenhagen
- Denmark
| |
Collapse
|
8
|
Siow KS, Britcher L, Kumar S, Griesser HJ. QCM-D and XPS study of protein adsorption on plasma polymers with sulfonate and phosphonate surface groups. Colloids Surf B Biointerfaces 2019; 173:447-453. [DOI: 10.1016/j.colsurfb.2018.10.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 08/31/2018] [Accepted: 10/08/2018] [Indexed: 10/28/2022]
|
9
|
Connelly C, Cicuto T, Leavitt J, Petty A, Litman A, Margolis HC, Gerdon AE. Dynamic interactions of amelogenin with hydroxyapatite surfaces are dependent on protein phosphorylation and solution pH. Colloids Surf B Biointerfaces 2016; 148:377-384. [PMID: 27632699 DOI: 10.1016/j.colsurfb.2016.09.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 08/03/2016] [Accepted: 09/07/2016] [Indexed: 10/21/2022]
Abstract
Amelogenin, the predominant extracellular matrix protein secreted by ameloblasts, has been shown to be essential for proper tooth enamel formation. In this study, amelogenin adsorption to hydroxyapatite (HAP) surfaces, a prototype for enamel mineral, has been studied using a quartz crystal microbalance (QCM) to interrogate effects of protein phosphorylation and solution pH. Dynamic flow-based experiments were conducted at pH 7.4 and 8.0 using native phosphorylated porcine amelogenin (P173) and recombinant non-phosphorylated porcine amelogenin (rP172). Loading capacities (μmol/m2) on HAP surfaces were calculated under all conditions and adsorption affinities (Kad) were calculated when Langmuir isotherm conditions appeared to be met. At pH 8.0, binding characteristics were remarkably similar for the two proteins. However, at pH 7.4 a higher affinity and lower surface loading for the phosphorylated P173 was found compared to any other set of conditions. This suggests that phosphorylated P173 adopts a more extended conformation than non-phosphorylated full-length amelogenin, occupying a larger footprint on the HAP surface. This surface-induced structural difference may help explain why P173 is a more effective inhibitor of spontaneous HAP formation in vitro than rP172. Differences in the viscoelastic properties of P173 and rP172 in the adsorbed state were also observed, consistent with noted differences in HAP binding. These collective findings provide new insight into the important role of amelogenin phosphorylation in the mechanism by which amelogenin regulates enamel crystal formation.
Collapse
Affiliation(s)
| | - Thomas Cicuto
- Emmanuel College, Department of Chemistry and Physics, Boston, MA 02115, USA
| | - Jason Leavitt
- Emmanuel College, Department of Chemistry and Physics, Boston, MA 02115, USA
| | - Alexander Petty
- Emmanuel College, Department of Chemistry and Physics, Boston, MA 02115, USA
| | - Amy Litman
- The Forsyth Institute, Center for Biomineralization, Department of Applied Oral Sciences, Cambridge, MA 02142, USA
| | - Henry C Margolis
- The Forsyth Institute, Center for Biomineralization, Department of Applied Oral Sciences, Cambridge, MA 02142, USA
| | - Aren E Gerdon
- Emmanuel College, Department of Chemistry and Physics, Boston, MA 02115, USA.
| |
Collapse
|
10
|
Mejias SH, Couleaud P, Casado S, Granados D, Garcia MA, Abad JM, Cortajarena AL. Assembly of designed protein scaffolds into monolayers for nanoparticle patterning. Colloids Surf B Biointerfaces 2016; 141:93-101. [PMID: 26844645 DOI: 10.1016/j.colsurfb.2016.01.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Revised: 12/01/2015] [Accepted: 01/20/2016] [Indexed: 10/22/2022]
Abstract
The controlled assembly of building blocks to achieve new nanostructured materials with defined properties at different length scales through rational design is the basis and future of bottom-up nanofabrication. This work describes the assembly of the idealized protein building block, the consensus tetratricopeptide repeat (CTPR), into monolayers by oriented immobilization of the blocks. The selectivity of thiol-gold interaction for an oriented immobilization has been verified by comparing a non-thiolated protein building block. The physical properties of the CTPR protein thin biomolecular films including topography, thickness, and viscoelasticity, are characterized. Finally, the ability of these scaffolds to act as templates for inorganic nanostructures has been demonstrated by the formation of well-packed gold nanoparticles (GNPs) monolayer patterned by the CTPR monolayer.
Collapse
Affiliation(s)
- Sara H Mejias
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Pierre Couleaud
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Santiago Casado
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Daniel Granados
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Miguel Angel Garcia
- Instituto de Cerámica y Vidrio (ICV-CSIC), Cantoblanco, 28049 Madrid, Spain; Instituto de Magnetismo Aplicado "Salvador Velayos", UCM-ADIF, 28230 Madrid, Spain
| | - Jose M Abad
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain; Departamento de Química Analítica y Análisis Instrumental, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
| | - Aitziber L Cortajarena
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain; CIC BiomaGUNE, Parque Tecnológico de San Sebastián, Paseo Miramón 182, Donostia-San Sebastián 20009, Spain.
| |
Collapse
|
11
|
Drücker P, Pejic M, Grill D, Galla HJ, Gerke V. Cooperative binding of annexin A2 to cholesterol- and phosphatidylinositol-4,5-bisphosphate-containing bilayers. Biophys J 2015; 107:2070-81. [PMID: 25418092 DOI: 10.1016/j.bpj.2014.08.027] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 08/14/2014] [Accepted: 08/27/2014] [Indexed: 10/24/2022] Open
Abstract
Biological membranes are organized into dynamic microdomains that serve as sites for signal transduction and membrane trafficking. The formation and expansion of these microdomains are driven by intrinsic properties of membrane lipids and integral as well as membrane-associated proteins. Annexin A2 (AnxA2) is a peripherally associated membrane protein that can support microdomain formation in a Ca(2+)-dependent manner and has been implicated in membrane transport processes. Here, we performed a quantitative analysis of the binding of AnxA2 to solid supported membranes containing the annexin binding lipids phosphatidylinositol-4,5-bisphosphate and phosphatidylserine in different compositions. We show that the binding is of high specificity and affinity with dissociation constants ranging between 22.1 and 32.2 nM. We also analyzed binding parameters of a heterotetrameric complex of AnxA2 with its S100A10 protein ligand and show that this complex has a higher affinity for the same membranes with Kd values of 12 to 16.4 nM. Interestingly, binding of the monomeric AnxA2 and the AnxA2-S100A10 complex are characterized by positive cooperativity. This cooperative binding is mediated by the conserved C-terminal annexin core domain of the protein and requires the presence of cholesterol. Together our results reveal for the first time, to our knowledge, that AnxA2 and its derivatives bind cooperatively to membranes containing cholesterol, phosphatidylserine, and/or phosphatidylinositol-4,5-bisphosphate, thus providing a mechanistic model for the lipid clustering activity of AnxA2.
Collapse
Affiliation(s)
- Patrick Drücker
- Institute of Biochemistry, University of Muenster, Muenster, Germany
| | - Milena Pejic
- Institute of Medical Biochemistry, ZMBE, University of Muenster, Muenster, Germany
| | - David Grill
- Institute of Medical Biochemistry, ZMBE, University of Muenster, Muenster, Germany
| | | | - Volker Gerke
- Institute of Medical Biochemistry, ZMBE, University of Muenster, Muenster, Germany.
| |
Collapse
|
12
|
Chen YC, Sun TP, Su CT, Wu JT, Lin CY, Yu J, Huang CW, Chen CJ, Chen HY. Sustained immobilization of growth factor proteins based on functionalized parylenes. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21906-21910. [PMID: 25434778 DOI: 10.1021/am5071865] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Protein molecules immobilized on biomaterial surfaces are performed based on oriented conjugation or replaced mimicking peptides. The sustainable immobilization of growth factor proteins using functionalized parylene coatings is demonstrated in this study. Site-specific and nonspecific immobilization approaches are realized to conjugate bone morphogenetic protein (BMP-2). The binding affinities and conformational changes of BMP-2 are confirmed by QCM and SPR characterizations. Osteoinduction of stem cells is examined by ALP activity on the BMP-2 modified surfaces. Finally, immobilizations and equally sustained biological functions of vascular endothelial growth factor (VEGF) and a mimicking peptide of KLTWQELYQLKYKG (QK) are also examined and confirmed.
Collapse
Affiliation(s)
- Yung-Chih Chen
- Department of Chemical Engineering, National Taiwan University , Taipei 10617, Taiwan
| | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Wang YL, Shih JS. Multi-Channel Piezoelectric Crystal Gas Sensor with Principal Component Analysis for Organic Solvent Pollutants from Polymer Plants. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200600189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
14
|
Liao YH, Shih JS. Piezoelectric Quartz Crystal Anti-Protein Immunosensors Based on Immobilized Fullerene C60-Proteins. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
15
|
Tang W, Ma Y, Xie S, Guo K, Katzenmeyer B, Wesdemiotis C, Becker ML. Valency-dependent affinity of bioactive hydroxyapatite-binding dendrons. Biomacromolecules 2013; 14:3304-13. [PMID: 23931528 DOI: 10.1021/bm400908c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Hydroxyapatite (HA)-coated surfaces are used widely as stationary phase for protein and enzyme purification, coatings for dental and orthopedic implants, and composite materials for tissue engineering substrates. More advanced applications are envisioned, but progress has been slowed by the limited ability to controllably functionalize the surface of HA with biomolecules in a translationally relevant manner. Herein we report the synthesis and characterization of a series of multivalent, HA-binding peptide bioconjugates with variable valency and tether length which afford the ability to precisely tune the desired binding behavior. The respective binding affinities of the multivalent constructs to HA surface were characterized by quartz crystal microbalance with dissipation monitoring (QCM-D) techniques, and the relationship between dendron structure and binding affinity was revealed. Tetravalent constructs of HA-binding peptides show a 100-fold enhancement in binding affinity compared to HA-binding peptide sequences reported previously. Both biotin and bone morphogenic protein-2 (BMP-2) derivative peptide were successfully linked to the focal point as initial demonstrations.
Collapse
Affiliation(s)
- Wen Tang
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
| | | | | | | | | | | | | |
Collapse
|
16
|
Shi L, Huang H, Sun L, Lu Y, Du B, Mao Y, Li J, Ye Z, Peng X. [Fe(CN)6]4− decorated mesoporous gelatin thin films for colorimetric detection and as sorbents of heavy metal ions. Dalton Trans 2013; 42:13265-72. [DOI: 10.1039/c3dt50823d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
17
|
Cheesman BT, Smith EG, Murdoch TJ, Guibert C, Webber GB, Edmondson S, Wanless EJ. Polyelectrolyte brush pH-response at the silica–aqueous solution interface: a kinetic and equilibrium investigation. Phys Chem Chem Phys 2013; 15:14502-10. [DOI: 10.1039/c3cp52281d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
18
|
Park J, Karsten SL, Nishida S, Kawakatsu H, Fujita H. Application of a new microcantilever biosensor resonating at the air-liquid interface for direct insulin detection and continuous monitoring of enzymatic reactions. LAB ON A CHIP 2012; 12:4115-4119. [PMID: 22847153 DOI: 10.1039/c2lc40232g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Here we describe the application of a recently developed high-resolution microcantilever biosensor resonating at the air-liquid interface for the continuous detection of antigen-antibody and enzyme-substrate interactions. The cantilever at the air-liquid interface demonstrated 50% higher quality factor and a 5.7-fold increase in signal-to-noise-ratio (SNR) compared with one immersed in the purified water. First, a label-free detection of a low molecular weight protein (insulin, 5.8 kDa) in physiological concentration was demonstrated. The liquid facing side of the cantilever was functionalized by coating its surface with insulin antibodies, while the opposite side was exposed to air. The meniscus membrane at the micro-slit around the cantilever sustained the liquid in the microchannel. After optimizing the process of surface functionalization, the resonance frequency shift was successfully measured for insulin solutions of 0.4, 2.0, and 6.3 ng ml(-1). To demonstrate additional application of the device for monitoring enzymatic protein degradation, the liquid facing microcantilever surface was coated with human recombinant SOD1 (superoxide dismutase 1) and exposed to various concentrations of proteinase K solution, and the kinetics of the SOD1 digestion was continuously monitored. The results showed that it is a suitable tool for sensitive protein detection and analysis.
Collapse
Affiliation(s)
- Jungwook Park
- Center for International Research on Micronano Mechatronics (CIRMM), Institute of Industrial Science (IIS), the University of Tokyo, 4-6-1 Komaba Meguro, Tokyo, 153-8505, Japan.
| | | | | | | | | |
Collapse
|
19
|
Reusable chromium-coated quartz crystal microbalance for immunosensing. Colloids Surf B Biointerfaces 2011; 88:191-5. [DOI: 10.1016/j.colsurfb.2011.06.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 05/27/2011] [Accepted: 06/22/2011] [Indexed: 11/20/2022]
|
20
|
QCM-D fingerprinting of membrane-active peptides. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2010; 40:437-46. [DOI: 10.1007/s00249-010-0652-5] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Revised: 11/17/2010] [Accepted: 11/23/2010] [Indexed: 01/17/2023]
|
21
|
Kao P, Parhi P, Krishnan A, Noh H, Haider W, Tadigadapa S, Allara DL, Vogler EA. Volumetric interpretation of protein adsorption: interfacial packing of protein adsorbed to hydrophobic surfaces from surface-saturating solution concentrations. Biomaterials 2010; 32:969-78. [PMID: 21035180 DOI: 10.1016/j.biomaterials.2010.09.075] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Accepted: 09/29/2010] [Indexed: 11/26/2022]
Abstract
The maximum capacity of a hydrophobic adsorbent is interpreted in terms of square or hexagonal (cubic and face-centered-cubic, FCC) interfacial packing models of adsorbed blood proteins in a way that accommodates experimental measurements by the solution-depletion method and quartz-crystal-microbalance (QCM) for the human proteins serum albumin (HSA, 66 kDa), immunoglobulin G (IgG, 160 kDa), fibrinogen (Fib, 341 kDa), and immunoglobulin M (IgM, 1000 kDa). A simple analysis shows that adsorbent capacity is capped by a fixed mass/volume (e.g. mg/mL) surface-region (interphase) concentration and not molar concentration. Nearly analytical agreement between the packing models and experiment suggests that, at surface saturation, above-mentioned proteins assemble within the interphase in a manner that approximates a well-ordered array. HSA saturates a hydrophobic adsorbent with the equivalent of a single square or hexagonally-packed layer of hydrated molecules whereas the larger proteins occupy two-or-more layers, depending on the specific protein under consideration and analytical method used to measure adsorbate mass (solution depletion or QCM). Square or hexagonal (cubic and FCC) packing models cannot be clearly distinguished by comparison to experimental data. QCM measurement of adsorbent capacity is shown to be significantly different than that measured by solution depletion for similar hydrophobic adsorbents. The underlying reason is traced to the fact that QCM measures contribution of both core protein, water of hydration, and interphase water whereas solution depletion measures only the contribution of core protein. It is further shown that thickness of the interphase directly measured by QCM systematically exceeds that inferred from solution-depletion measurements, presumably because the static model used to interpret solution depletion does not accurately capture the complexities of the viscoelastic interfacial environment probed by QCM.
Collapse
Affiliation(s)
- Ping Kao
- Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Howard SC, Craig VSJ, FitzGerald PA, Wanless EJ. Swelling and collapse of an adsorbed pH-responsive film-forming microgel measured by optical reflectometry and QCM. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:14615-14623. [PMID: 20795665 DOI: 10.1021/la1023218] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The swelling and deswelling of a pH-responsive electrosterically stabilized poly[2-(diethylamino)ethyl methacrylate] microgel adsorbed to silica surfaces have been quantified using the techniques of optical reflectometry (OR) and quartz crystal microbalance (QCM). It is shown that by utilizing and comparing OR measurements performed on wafers with differing oxide layer thicknesses the adsorbed amount and film thickness of the adsorbed microgel in both the swollen and deswollen forms can be determined. Also, the kinetics of the transition can be followed, revealing that collapse is a slower process than swelling, and direct support is provided for the formation of a dense outer layer or skin during collapse that slows the deswelling process. It is shown that the adsorption of this low glass transition temperature film-forming microgel latex is robust to changes in pH after an initial swelling event which is responsible for desorption of a large and variable fraction of the initially adsorbed polymer. Subsequent deswelling and swelling of the adsorbed film indicates that adsorption to a surface greatly hinders the volumetric swelling capacity of the microgel film. In its swollen state the film is only 3-4 times thicker than the collapsed film, whereas for particles in bulk the volume increases by a factor of 20 upon protonation of the tertiary amine residues. QCM results show that even in the collapsed form the film contains a considerable amount of water. Further, the viscoelasticity of the deswollen film is similar to that of the swollen film, suggesting that the degree of cross-linking is the primary determinant of viscoelasticity.
Collapse
Affiliation(s)
- Shaun C Howard
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia
| | | | | | | |
Collapse
|
23
|
Yeo J, Park JY, Bae WJ, Lee YS, Kim BH, Cho Y, Park SM. Label-free electrochemical detection of the p53 core domain protein on its antibody immobilized electrode. Anal Chem 2009; 81:4770-7. [PMID: 19435284 DOI: 10.1021/ac900301h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We report quantitative results on interactions between a tumor suppressor protein, p53, also known as a prognostic cancer marker, and its antibody. The p53 antibody molecules immobilized on an (R)-lipo-diaza-18-crown-6 self-assembled monolayer (SAM)-modified gold disk electrode were shown to effectively capture the p53 protein by Western blot, quartz crystal microbalance, and electrochemical impedance experiments. The p53 protein thus captured modulated the ability of the electrode for charge transfer to and from a redox probe in the solution in a p53 concentration range of approximately 0.1-30 microg/mL. The same interaction was also observed in the human embryonic kidney cell lysate, demonstrating that the SAM-modified electrode can serve as a selective platform for electrochemically monitoring the cellular p53 concentration.
Collapse
Affiliation(s)
- Jongchan Yeo
- Department of Chemistry, Center for Integrated Molecular Systems, Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784, Korea
| | | | | | | | | | | | | |
Collapse
|
24
|
Bi X, Yang KL. On-line monitoring imidacloprid and thiacloprid in celery juice using quartz crystal microbalance. Anal Chem 2009; 81:527-32. [PMID: 19086904 DOI: 10.1021/ac801786a] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this article, we report a quartz crystal microbalance (QCM)-based detection method which allows the identification and quantification of two neonicotinoid pesticides, imidacloprid and thiacloprid, in aqueous solutions and celery juice. To achieve high selectivity, molecular imprinted monolayers (MIMs), which can either recognize 1 muM of imidacloprid or 1 muM of thiacloprid, are prepared from alkanethiols self-assembled on QCM sensor chips with preadsorbed templates (either imidacloprid or thiacloprid). Our experimental results show that the detection limit can be improved by using alkanethiols having longer hydrocarbon chains. For example, MIMs prepared from hexadecanethiol have dissociation constants 2-5 times smaller than those prepared from octanethiol. To detect two neonicotinoids in vegetable samples simultaneously, we also develop a new type of MIM with two different templates. A single QCM decorated with this MIM can respond to 10 muM of imidacloprid and 10 muM thiacloprid in celery juice in a real-time manner.
Collapse
Affiliation(s)
- Xinyan Bi
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore
| | | |
Collapse
|
25
|
Furusawa H, Ozeki T, Morita M, Okahata Y. Added Mass Effect on Immobilizations of Proteins on a 27 MHz Quartz Crystal Microbalance in Aqueous Solution. Anal Chem 2009; 81:2268-73. [DOI: 10.1021/ac802412t] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hiroyuki Furusawa
- Department of Biomolecular Engineering, Tokyo Institute of Technology and SENTAN, JST, 4259 Nagatsuda, Midori-ku, Yokohama 226-8501, Japan, and Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Tomomitsu Ozeki
- Department of Biomolecular Engineering, Tokyo Institute of Technology and SENTAN, JST, 4259 Nagatsuda, Midori-ku, Yokohama 226-8501, Japan, and Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Mizuki Morita
- Department of Biomolecular Engineering, Tokyo Institute of Technology and SENTAN, JST, 4259 Nagatsuda, Midori-ku, Yokohama 226-8501, Japan, and Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Yoshio Okahata
- Department of Biomolecular Engineering, Tokyo Institute of Technology and SENTAN, JST, 4259 Nagatsuda, Midori-ku, Yokohama 226-8501, Japan, and Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| |
Collapse
|
26
|
Bi X, Xu H, Lai SL, Yang KL. Bifunctional oligo(ethylene glycol) decorated surfaces which permit covalent protein immobilization and resist protein adsorption. BIOFOULING 2009; 25:435-444. [PMID: 19337888 DOI: 10.1080/08927010902875121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this article, surface coatings derived from homo-bifunctional tri(ethylene glycol) (EG(3)) and hexa(ethylene glycol) (EG(6)) molecules which have two terminal aldehyde groups are reported. These homo-bifunctional molecules can be used to functionalize amine-terminated surfaces through crosslinking one aldehyde group to surface amine groups, while leaving the other aldehyde group available for covalent immobilization of proteins. Best of all, after reducing remaining aldehyde groups on the surface with a reducing agent, sodium borohydride, the surface becomes oligo(ethylene glycol) (OEG)-terminated. The OEG-terminated surface can resist nonspecific protein adsorption, a feature that is often required for many biosensors and biomedical devices. Although some mixed self-assembled monolayers formed from two different organothiols also permit covalent protein immobilization and resist nonspecific protein adsorption, the procedure reported herein requires only one type of homo-bifunctional molecule and can be applied to both silicon and gold surfaces.
Collapse
Affiliation(s)
- Xinyan Bi
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, Singapore
| | | | | | | |
Collapse
|
27
|
Takahashi S, Matsuno H, Furusawa H, Okahata Y. Direct monitoring of allosteric recognition of type IIE restriction endonuclease EcoRII. J Biol Chem 2008; 283:15023-30. [PMID: 18367450 PMCID: PMC3258892 DOI: 10.1074/jbc.m800334200] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2008] [Revised: 03/13/2008] [Indexed: 11/06/2022] Open
Abstract
EcoRII is a homodimer with two domains consisting of a DNA-binding N terminus and a catalytic C terminus and recognizes two specific sequences on DNA. It shows a relatively complicated cleavage reaction in bulk solution. After binding to either recognition site, EcoRII cleaves the other recognition site of the same DNA (cis-binding) strand and/or the recognition site of the other DNA (trans-binding) strand. Although it is difficult to separate these two reactions in bulk solution, we could simply obtain the binding and cleavage kinetics of only the cis-binding by following the frequency (mass) changes of a DNA-immobilized quartz-crystal microbalance (QCM) responding to the addition of EcoRII in aqueous solution. We obtained the maximum binding amounts (Deltam(max)), the dissociation constants (K(d)), the binding and dissociation rate constants (k(on) and k(off)), and the catalytic cleavage reaction rate constants (k(cat)) for wild-type EcoRII, the N-terminal-truncated form (EcoRII N-domain), and the mutant derivatives in its C-terminal domain (K263A and R330A). It was determined from the kinetic analyses that the N-domain, which covers the catalytic C-domain in the absence of DNA, preferentially binds to the one DNA recognition site while transforming EcoRII into an active form allosterically, and then the secondary C-domain binds to and cleaves the other recognition site of the DNA strand.
Collapse
Affiliation(s)
| | | | | | - Yoshio Okahata
- Frontier Research Center, Department of Biomolecular Engineering, Tokyo Institute of Technology, B-53 4259 Nagatsuda, Midori-ku, Yokohama, Japan
| |
Collapse
|
28
|
Manaka Y, Kudo Y, Yoshimine H, Kawasaki T, Kajikawa K, Okahata Y. Simultaneous anomalous reflection and quartz-crystal microbalance measurements of protein bindings on a gold surface. Chem Commun (Camb) 2007:3574-6. [DOI: 10.1039/b708901e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
29
|
Ozeki T, Morita M, Yoshimine H, Furusawa H, Okahata Y. Hydration and Energy Dissipation Measurements of Biomolecules on a Piezoelectric Quartz Oscillator by Admittance Analyses. Anal Chem 2006; 79:79-88. [PMID: 17194124 DOI: 10.1021/ac060873x] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
By using a 27-MHz piezoelectric quartz oscillator connected with a vector network analyzer, we obtained resonance frequency decreases (-DeltaFwater) and energy dissipation increases (DeltaDwater) during binding of biotinylated bovine serum albumin, biotinylated ssDNA, biotinylated dsDNA, and biotinylated pullulan to a NeutrAvidin-immobilized 27-MHz quartz crystal microbalance (QCM) plate in aqueous solution, as well as in the wet air phase (98% humidity, -DeltaFwet and DeltaDwet) and in the dry air phase (-DeltaFair and DeltaDair). -DeltaFwater indicates the total mass of the molecule, bound water, and vibrated water in aqueous solutions. -DeltaFwet indicates the total mass of the molecule and bound water. -DeltaFair simply shows the real mass of the molecule on the QCM. In terms of results, (-DeltaFwet)/(-DeltaFair) values indicated the bound water ratios per unit biomolecular mass were on the order of pullulan (2.1-2.2) > DNAs = proteins (1.4-1.6) > polystyrene (1.0). The (-DeltaFwater)/(-DeltaFair) values indicated the hydrodynamic water (bound and vibrated water) ratios per unit biomolecular mass were on the order of dsDNA (6.5) > ssDNA = pullulan (3.5-4.4) > proteins (2.4-2.5) > polystyrene (1.0). Energy dissipation parameters per unit mass in water (DeltaDwater/(-DeltaFair)) were on the order of pullulan > dsDNA > ssDNA > proteins > polystyrene. Energy dissipation in the wet and dry air phases (DeltaDwet and DeltaDair) were negligibly small, which indicates even these biomolecules act as elastic membranes in the air phase (without aqueous solution). We obtained a good linear relationship between [(-DeltaFwater)/(-DeltaFair) - 1], which is indicative of hydration and DeltaDwater/(-DeltaFair) of proteins. The aforementioned values suggest that the energy dissipation of proteins was mainly caused by hydration and that proteins themselves are elastic molecules without energy dissipation in aqueous solutions. On the contrary, plots in cases of denatured proteins, DNAs, and pullulans were relatively deviant toward the large hydration and energy dissipation from the theoretical line as perfect elastic materials, meaning that the large energy dissipation occurs because of viscoelastic properties of denatured proteins, linear DNAs, and pullulans in the water phase, in addition to energy dissipation due to the hydration of molecules. These two parameters could characterize various biomolecules with structural properties in aqueous solutions.
Collapse
Affiliation(s)
- Tomomitsu Ozeki
- Department of Biomolecular Engineering, Frontier Collaborative Research Center, Tokyo Institute of Technology and CREST, Japan Science and Technology Corporation (JST), 4259 Nagatsuta, Midori-ku, Yokohama 226-8501, Japan
| | | | | | | | | |
Collapse
|
30
|
Rodríguez Seguí S, Pla M, Minic J, Pajot‐Augy E, Salesse R, Hou Y, Jaffrezic‐Renault N, Mills CA, Samitier J, Errachid A. Detection of Olfactory Receptor I7 Self‐Assembled Multilayer Formation and Immobilization Using a Quartz Crystal Microbalance. ANAL LETT 2006. [DOI: 10.1080/00032710600714030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
31
|
Su XL, Li Y. A QCM immunosensor for Salmonella detection with simultaneous measurements of resonant frequency and motional resistance. Biosens Bioelectron 2005; 21:840-8. [PMID: 16257651 DOI: 10.1016/j.bios.2005.01.021] [Citation(s) in RCA: 149] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2004] [Revised: 01/14/2005] [Accepted: 01/25/2005] [Indexed: 11/29/2022]
Abstract
A quartz crystal microbalance (QCM) immunosensor was described for the detection of Salmonella Typhimurium with simultaneous measurements of the resonant frequency and motional resistance. The immunosensor was fabricated using protein A for the antibody immobilization. High-frequency impedance analysis indicated that the changes in resonant frequency and motional resistance (DeltaF and DeltaR) of the QCM were significant while the changes in static capacitance, motional capacitance, and motional inductance were insignificant. In the direct detection of S. Typhimurium in chicken meat sample, DeltaF and DeltaR were proportional to the cell concentration in the range of 10(5) - 10(8) and 10(6) - 10(8) cells/ml, respectively. Using anti-Salmonella-magnetic beads as a separator/concentrator for sample pretreatment as well as a marker for signal amplification, the detection limit was lowered to 10(2) cells/ml based on the DeltaR measurement; however, DeltaF was not related to the cell concentration. No interference was observed from E. coli K12 or the sample matrix.
Collapse
Affiliation(s)
- Xiao-Li Su
- Department of Biological and Agricultural Engineering, The University of Arkansas, Fayetteville, 72701, USA
| | | |
Collapse
|
32
|
Gerdon AE, Wright DW, Cliffel DE. Quartz Crystal Microbalance Detection of Glutathione-Protected Nanoclusters Using Antibody Recognition. Anal Chem 2005; 77:304-10. [PMID: 15623309 DOI: 10.1021/ac048953t] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A quartz crystal microbalance (QCM) immunosensor was developed for the quantitative detection of glutathione-protected nanoclusters. Advantages intrinsic to QCM were employed to make it an attractive alternative to other immunosensing techniques. We have addressed challenges in the area of QCM mass sensing through experimental correlation between damping resistance and frequency change for a reliable mass measurement. Electrode functionalization was optimized with the use of protein A to immobilize and present polyclonal IgG for antigen binding. This method was developed for the detection of glutathione (antigen)-protected clusters of nanometer size with high surface area and thiolate valency. Quantitation of glutathione-nanocluster binding to immobilized polyclonal antibody provides equilibrium constants (K(a) = (3.6 +/- 0.2) x 10(5) M(-1)) and kinetic rate constants (k(f) = (5.4 +/- 0.7) x 10(1) M(-1) s(-1) and k(r) = (1.5 +/- 0.4) x10(-4) s(-1)) comparable to literature reports. These observations further imply that immunoreactive nanoparticles have potential in medical diagnostics and materials assembly.
Collapse
Affiliation(s)
- Aren E Gerdon
- Department of Chemistry, Vanderbilt University, VU Station B, Nashville, TN 37235-1822, USA
| | | | | |
Collapse
|
33
|
Ha TH, Kim S, Lim G, Kim K. Influence of liquid medium and surface morphology on the response of QCM during immobilization and hybridization of short oligonucleotides. Biosens Bioelectron 2004; 20:378-89. [PMID: 15308244 DOI: 10.1016/j.bios.2004.02.027] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2003] [Revised: 02/09/2004] [Accepted: 02/11/2004] [Indexed: 10/26/2022]
Abstract
With the goal of developing a quartz crystal microbalance (QCM)-based DNA sensor, we have conducted an in situ QCM study along with fluorescence measurements using oligonucleotides (15-mer) as a model single-stranded DNA (ss-DNA) in two different aqueous buffer solutions; the sequence of 15-mer is a part of iduronate-2-sulphate exon whose mutation is known to cause Hunter syndrome, and the 15-mer is thiolated to be immobilized on the Au-coated quartz substrate. The fluorescence data indicate that the initial immobilization as well as the subsequent hybridization with a complementary strand is hardly dependent on the kind of buffer solution. In contrast, the mass increases deducible from the decrease of QCM frequency via the Sauerbrey equation are 2.7-6.2 and 3.0-4.4 times larger than the actual mass increases, as reflected in the fluorescence measurements, for the immobilization and the subsequent hybridization processes, respectively. Such an overestimation is attributed to the trapping of solvent as well as the formation of quite a rigid hydration layer associated with the higher viscosities and/or densities of the buffer solutions. Another noteworthy observation is the excessively large frequency change that occurs when the gold electrode is deposited in advance with Au nanoparticles. This clearly illustrates that the QCM detection of DNA hybridization is also affected greatly by the surface morphology of the electrode. These enlarged signals are altogether presumed to be advantageous when using a QCM system as an in situ probing device in DNA sensors.
Collapse
Affiliation(s)
- Tai Hwan Ha
- Laboratory of Intelligent Interfaces, School of Chemistry and Molecular Engineering, Seoul National University, Seoul 151-742, Republic of Korea
| | | | | | | |
Collapse
|
34
|
Calvo EJ, Danilowicz C, Lagier CM, Manrique J, Otero M. Characterization of self-assembled redox polymer and antibody molecules on thiolated gold electrodes. Biosens Bioelectron 2004; 19:1219-28. [PMID: 15046753 DOI: 10.1016/j.bios.2003.11.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2003] [Revised: 11/14/2003] [Accepted: 11/14/2003] [Indexed: 11/29/2022]
Abstract
Multilayer immobilization of antibody and redox polymer molecules on a gold electrode was achieved, as a strategy for the potential development of an amperometric immunosensor. The step-by-step assembly of antibiotin IgG on Os(bpy)(2)ClPyCH(2)NH poly(allylamine) redox polymer (PAH-Os) adsorbed on thiolated gold electrodes was proved by quartz crystal microbalance (QCM) and atomic force microscopy (AFM) experiments, confirming the electrochemical evidence. The increase of redox charge during the layer-by-layer deposition demonstrated that charge propagation within the layers is feasible. The multilayer structure proved to be effective for the molecular recognition of horseradish peroxidase-biotin conjugate (HRP-biotin), as confirmed by the QCM measurements and the electrocatalytic reduction current obtained upon H(2)O(2) addition. The catalytic current resulting from PAH-Os mediation was shown to increase with the number of assembled layers. Furthermore, the inventory of IgG molecules on the supramolecular self-assembled structure and the specific and non-specific binding of HRP-biotin conjugate were confirmed by the QCM transient studies, giving information on the kinetics of IgG deposition and HRP-biotin conjugate binding to the IgG.
Collapse
Affiliation(s)
- E J Calvo
- INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria AR-1428, Buenos Aires, Argentina.
| | | | | | | | | |
Collapse
|
35
|
Briseno AL, Han S, Rauda IE, Zhou F, Toh CS, Nemanick EJ, Lewis NS. Electrochemical polymerization of aniline monomers infiltrated into well-ordered truncated eggshell structures of polyelectrolyte multilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:219-26. [PMID: 15745024 DOI: 10.1021/la035198q] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The use of nanosphere lithography to construct two-dimensional arrays of polystyrene (PS) particles coated with multilayered polyelectrolyte (PE) shells and truncated eggshell structures composed of PE thin layers is reported. The truncated eggshell PE structures were produced by extraction of the PS particle cores with toluene. The core-extraction process ruptures the apex of the PE coating and causes a slight expansion of the PE thin layers. Aniline hydrochloride was infiltrated into the PE shells and subsequently electropolymerized to yield an array of a composite containing polyaniline (PAni) and PE thin shells. Voltammetric, quartz crystal microbalance, and reflectance Fourier transform infrared spectroscopic measurements indicate that aniline monomers were confined within the thin PE shells and the electropolymerization occurred in the interior of the PE shell. The PE thickness governs the amount of infiltrated monomer and the ultimate loading of the PAni in the truncated eggshell structure. Surface-structure imaging by atomic force microscopy and scanning electron microscopy, carried out after each step of the fabrication process, shows the influence of the PE thickness on the organization and dimensions of the arrays. Thus, the PE thin shells composed of different layers can function as nanometer-sized vessels for the entrapment of charged species for further construction of composite materials and surface modifications. This approach affords a new avenue for the synthesis of new materials that combine the unique properties of conductive polymers and the controllability of template-directed surface reactions.
Collapse
Affiliation(s)
- Alejandro L Briseno
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, USA
| | | | | | | | | | | | | |
Collapse
|
36
|
Sekiguchi A, Isono M, Kono Y, Sensu Y. In-situ Measurement of Outgassing from Chemically Amplified Resist during Exposure to 248nm Light. J PHOTOPOLYM SCI TEC 2004. [DOI: 10.2494/photopolymer.17.107] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
37
|
Su XL, Li Y. A self-assembled monolayer-based piezoelectric immunosensor for rapid detection of Escherichia coli O157:H7. Biosens Bioelectron 2004; 19:563-74. [PMID: 14683640 DOI: 10.1016/s0956-5663(03)00254-9] [Citation(s) in RCA: 208] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A piezoelectric immunosensor was developed for rapid detection of Escherichia coli O157:H7. It was based on the immobilization of affinity-purified antibodies onto a monolayer of 16-mercaptohexadecanoic acid (MHDA), a long-chain carboxylic acid-terminating alkanethiol, self-assembled on an AT-cut quartz crystal's Au electrode surface with N-hydroxysuccinimide (NHS) ester as a reactive intermediate. The binding of target bacteria onto the immobilized antibodies decreased the sensor's resonant frequency, and the frequency shift was correlated to the bacterial concentration. The stepwise assembly of the immunosensor was characterized by means of both quartz crystal microbalance (QCM) and cyclic voltammetry techniques. Three analytical procedures, namely immersion, dip-and-dry and flow-through methods, were investigated. The immunosensor could detect the target bacteria in a range of 10(3)-10(8)CFU/ml within 30-50 min, and the sensor-to-sensor reproducibility obtained at 10(3) and 10(5) colony-forming units (CFU)/ml was 18 and 11% R.S.D., respectively. The proposed sensor was comparable to Protein A-based piezoelectric immunosensor in terms of the amount of immobilized antibodies and detection sensitivity.
Collapse
Affiliation(s)
- Xiao-Li Su
- Department of Biological and Agricultural Engineering, The University of Arkansas, Fayetteville, AR 72701, USA
| | | |
Collapse
|
38
|
Forzani ES, Teijelo ML, Nart F, Calvo EJ, Solís VM. Effect of the polycation nature on the structure of layer-by-layer electrostatically self-assembled multilayers of polyphenol oxidase. Biomacromolecules 2003; 4:869-79. [PMID: 12857067 DOI: 10.1021/bm0256855] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Self-assembled multilayers comprised of alternate layers of polyphenol oxidase (PPO) and poly(allylamine) (PAH) or PPO and poly(diallyldimethylamine) (PDDA), deposited on a 3-mercaptopropanesulfonic acid (MPS)-modified gold surface, were studied "in-situ" (under water) by means of ellipsometry and quartz crystal microbalance (QCM), and "ex-situ" (in open air) by ellipsometry and fourier transform infrared reflection-absorption spectroscopy (FT-IRRAS). Optical ellipsometric properties of (PAH)(n)(PPO)(n) and (PDDA)(n)(PPO)(n) multilayers were obtained at two wavelengths, employing an isotropic single-layer model with the substrate parameters measured after thiol adsorption. Film thickness as well as ellipsometric mass values based on the de Feijter equation were also evaluated. The quartz crystal impedance analysis showed that self-assembled multilayers behaved as acoustically thin films, and therefore, the shifts observed in the film inductive impedance parameter were interpreted in terms of gravimetric mass. The enzyme mass up-take in each adsorption step was determined on PAH or on PDDA topmost layer. A comparative study between the ellipsometric thickness and acoustic mass values allowed us to obtain average values of "apparent" densities of (2.1 +/- 0.1) and (2.4 +/- 0.1) g cm(-3) for (PAH)(n)(PPO)(n) and (PDDA)(n)(PPO)(n) multilayers, respectively. The content of water included in the open polymer-enzyme structure was evaluated by comparison of QCM and ellipsometric mass values. FT-IRRAS spectra of each layer in (PAH)(n)(PPO)(n) and (PDDA)(n)(PPO)(n) films were recorded, and the intensity ratio of the amide bands was evaluated to obtain information about layer-by-layer enzyme conformation. An enzyme/polycation distribution model for (PAH)(n)(PPO)(n)and (PDDA)(n)(PPO)(n) multilayer structures is presented on the basis of combined ellipsometric, QCM, and FT-IRRAS results.
Collapse
Affiliation(s)
- Erica S Forzani
- INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Pabellón 2, Ciudad Universitaria, AR-1428 Buenos Aires, Argentina
| | | | | | | | | |
Collapse
|
39
|
Craig VSJ, Plunkett M. Determination of coupled solvent mass in quartz crystal microbalance measurements using deuterated solvents. J Colloid Interface Sci 2003; 262:126-9. [PMID: 16256589 DOI: 10.1016/s0021-9797(03)00210-8] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2002] [Accepted: 02/20/2003] [Indexed: 11/20/2022]
Abstract
A simple method is described for determining of the contribution of hydrodynamically coupled solvent to the adsorbed film mass determined in a quartz crystal microbalance (QCM) when operated in liquid. The method requires no additional apparatus and utilizes the change in QCM resonant frequency response between measurements made in non-deuterated and deuterated solvents. The mass of coupled water in a polymer film has been determined and is found to agree with that determined by XPS analysis of the dried polymer film.
Collapse
Affiliation(s)
- Vincent S J Craig
- Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia.
| | | |
Collapse
|
40
|
Pei R, Cui X, Yang X, Wang E. Assembly of alternating polycation and DNA multilayer films by electrostatic layer-by-layer adsorption. Biomacromolecules 2003; 2:463-8. [PMID: 11749207 DOI: 10.1021/bm0001289] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The assembly of alternating DNA and positively charged poly(dimethyldiallylammonium chloride) (PDDA) multilayer films by electrostatic layer-by-layer adsorption has been studied. The real-time surface plasmon resonance (BIAcore) technique was used to characterize and monitor the formation of multilayer films in solution in real time continuously. Electrochemical impedance spectroscopy (EIS) and UV-vis absorbance measurements were also used to study the film assembly, and linear film growth was observed. All the results indicate that the uniform multilayer can be obtained on the poly(ethylenimine)- (PEI-) coated substrate surface. The kinetics of the adsorption of DNA on PDDA surface was also studied by the real-time BIAcore technique; the observed rate constant was calculated using a Langmuir model (k(obs) = (1.28 +/- 0.08) x 10(-2) s(-1).
Collapse
Affiliation(s)
- R Pei
- Laboratory of Electroanalytical Chemistry and National Analytical Research Center of Electrochemistry and Spectroscopy, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China
| | | | | | | |
Collapse
|
41
|
Chapter 7 Chemically modified electrodes with integrated biomolecules and molecular wires. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0166-526x(03)80112-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
|
42
|
Calvo EJ, Forzani ES, Otero M. Study of layer-by-layer self-assembled viscoelastic films on thickness-shear mode resonator surfaces. Anal Chem 2002; 74:3281-9. [PMID: 12139030 DOI: 10.1021/ac0157425] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe quartz crystal electroacoustic admittance studies in thickness shear mode resonators loaded with self-assembled multilayers composed of alternate layers of glucose oxidase (GOx) and poly(allylamine) covalently attached to [Os(bpy)2ClPyCOH]- , (PAH-Os), deposited on a 3-mercaptopropanesulfonic acid (MPS)-modified gold on the quartz crystal. The complex acoustic impedance parameters, R(S) and X(LS) of a lumped-element Butterworth-Van Dyke (BVD) resonator have been determined for organized thin films of different thickness obtained by varying the number of enzyme layers, n, in (PAH-Os)n(GOx)n structures. The ellipsometric film thickness and mass for dry enzyme multilayer films and films in contact with water were evaluated, and the average film density was estimated. By combination of the estimated film thickness and density, the expression for the surface mechanical impedance of the lumped-element modified resonator (Granstaff and Martin model), and the liquid density and viscosity, we simulate the layer-by-layer film growth on the basis of the measured electroacoustic impedance. The complex impedance X(LS) and R(S) increase with film thickness and the enzyme films can be regarded as acoustically thin in the reduced state for films thinner than 600 nm. We have also measured electroacoustic parameters for PAH-Os/GOx self-assembled multilayers under electrochemical perturbation in a buffer electrolytic solution. The electrostatically self-assembled multilayers behaved as lossy viscoelastic films at 10 MHz with G'f and G''f on the order of 10(6) Pa. The films became viscoelastic upon oxidation to Os(III), resulting in an increase of R(S) and X(LS) in the oxidized state with the number of (PAH-Os)(GOx) bilayers due to film swelling and an increase in the shear moduli during oxidation.
Collapse
Affiliation(s)
- Ernesto J Calvo
- INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Argentina.
| | | | | |
Collapse
|
43
|
Yuan Y, Cai Y, Xie Q, Yao S. Piezoelectric quartz crystal impedance study of the Pb2+-induced precipitation of bovine serum albumin and its dissolution with EDTA in an aqueous solution. ANAL SCI 2002; 18:767-71. [PMID: 12137371 DOI: 10.2116/analsci.18.767] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The piezoelectric quartz crystal impedance technique (QCI) was employed to monitor in situ the Pb2+-induced precipitation of BSA onto a gold electrode and the precipitate dissolution with EDTA in an aqueous solution. The critical precipitation concentration of Pb2+, at which the resonant frequency decreased significantly, was estimated to be 4.78 x 10(-4) mol/L. The saturated adherence of the precipitate on the electrode was observed when the concentration of Pb2+ was greater than 7.53 x 10(-2) mol/L. The frequency response was mainly caused by the mass effect of the precipitate adherence to the electrode, rather than the changes in the physico-chemical properties of the contacting liquid. An excess addition of Na2EDTA after the Pb2+-BSA dissolution led to new precipitation, probably due to the formation of an EDTA precipitate in this medium (pH approximately 3). The pH effect on the response of the resonant frequency was analyzed by using the sum of two exponential functions. A larger frequency response occurred at a pH greater than pI. These findings have been reasonably explained. Also, a decrease in the concentration of the background electrolyte increased the frequency response.
Collapse
|
44
|
Kitano H, Saito T, Kanayama N. Substrate Monolayers as Electrochemical Sensing Elements for α-Chymotrypsin. J Colloid Interface Sci 2002; 250:134-41. [PMID: 16290644 DOI: 10.1006/jcis.2002.8312] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2001] [Accepted: 02/21/2002] [Indexed: 11/22/2022]
Abstract
A disulfide, which carried two L-phenylalanyl p-nitroanilide (Phe-pNA) moieties at both ends, was prepared by the coupling of 11,11'-dithiodiundecanoic acid (DTUA) with Phe-pNA. The compound obtained (DTUA-Phe-pNA) formed a self-assembled monolayer (SAM) on a gold electrode and vacuum-evaporated gold thin film as proven by cyclic voltammetry, and reflection absorption spectroscopy, respectively. Incubation of alpha-chymotrypsin with the SAM-modified electrode induced both a decrease in anodic and cathodic peak currents (-DeltaIa and -DeltaIc) and an increase in potential difference (DeltaEp) in the cyclic voltammogram of potassium ferricyanide as a probe, which suggested the attack of the enzyme at the amide group between Phe and pNA groups of the SAM, resulting in the formation of an intermediate. The linear relationship between the initial rate of increase in the amount of enzyme bound to the SAM and in both DeltaIa (absolute value of the decrease in anodic peak current) and DeltaEp values was confirmed by the quartz crystal microbalance method. The binding rate of the enzyme to the Phe-pNA SAM was dependent on the surface density of the Phe-pNA group in the SAM. The alpha-chymotrypsin-induced increases in the DeltaIa and DeltaEp values were inhibited by the addition of N-acetyl-D-phenylalanine methyl ester (N-Ac-D-Phe-OMe). In contrast with alpha-chymotrypsin, trypsin did not show a significant increase in the DeltaIa and DeltaEp values upon incubation with Phe-pNA-carrying SAM. These results could be attributed to the specific attack of alpha-chymotrypsin to the amide group in the SAM. The inhibition constant for N-Ac-D-Phe-OMe in the SAM system was quite similar to that in the free substrate system, showing that the enzymatic reaction above the SAM proceeds in a similar way to that in the homogeneous solution system.
Collapse
Affiliation(s)
- Hiromi Kitano
- Department of Chemical and Biochemical Engineering, Toyama University, Toyama, 930-8555, Japan
| | | | | |
Collapse
|
45
|
Matsumoto N, Chen X, Wilson GS. Fundamental studies of glucose oxidase deposition on a Pt electrode. Anal Chem 2002; 74:362-7. [PMID: 11811409 DOI: 10.1021/ac015536x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The direct electrodeposition of glucose oxidase (EC 1.1.3.4) on a platinum electrode was investigated as a means for controlled immobilization. The presence of a nonionic detergent, Triton X-100, was found essential to produce a multilayered deposit. Moreover, to work properly, the detergent must be present above its critical micelle concentration. Under these conditions, a deposit of approximately 50 enzyme layers (480 nm), with surface uniformity of +/-20 nm, was verified using an electrochemical quartz crystal microbalance and by atomic force microscopy. In the absence of detergent, a layer of 25 nm is formed. Contrary to most previous claims, the deposition, which is potential dependent but optimal at 1.3 V versus AgCl/Ag electrode, is not electrophoretically driven, but is instead controlled by a lowering of the pH at the electrode surface due to concomitant oxygen evolution.
Collapse
Affiliation(s)
- Norio Matsumoto
- Department of Chemistry, University of Kansas, Lawrence 66045, USA
| | | | | |
Collapse
|
46
|
Mao Y, Wei W, Zhang J, Peng H, Wu L. A new piezoelectric response model for protein adsorption kinetics at a solid–liquid interface. Microchem J 2001. [DOI: 10.1016/s0026-265x(01)00108-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
47
|
Yin F, Zhang Y, Wu Y, Cai Y, Xie Q, Yao S. Study of bovine serum albumin adsorption onto a silicon dioxide surface using a ring-electrode piezoelectric sensor. Anal Chim Acta 2001. [DOI: 10.1016/s0003-2670(01)01216-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
48
|
Spangler BD, Wilkinson EA, Murphy JT, Tyler BJ. Comparison of the Spreeta® surface plasmon resonance sensor and a quartz crystal microbalance for detection of Escherichia coli heat-labile enterotoxin. Anal Chim Acta 2001. [DOI: 10.1016/s0003-2670(01)01156-4] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
49
|
Arnau A, Jiménez Y, Sogorb T. An extended Butterworth-Van Dyke model for quartz crystal microbalance applications in viscoelastic fluid media. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2001; 48:1367-1382. [PMID: 11570762 DOI: 10.1109/58.949746] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
An extended Butterworth-Van Dyke (EBVD) model with frequency-independent parameters for the characterization of a resonant compound formed by a quartz crystal in contact with a finite viscoelastic layer contacting a semi-infinite viscoelastic medium is extracted by analysis of the lumped element model. The formulation of the EBVD model is compared with the complete expression of the electrical admittance of the loaded quartz derived from the transmission line model (TLM). Relative deviations between them do not exceed 3% around 1% bandwidth near resonance. An extended Martin & Granstaff's model and an explicit expression for the frequency shift that supposes an extension of Kanazawa's model for viscoelastic media are obtained. An analysis of the errors associated with the extraction of shear parameters of the coating for different materials prove that, to obtain an error less than 5% in the shear parameters determination, the viscoelastic contribution, defined as the relative error in the thickness computed from the frequency shift by Sauerbrey equation, must be greater than a limit that depends on Q, which is defined as the ratio of the shear storage modulus (G') to shear loss modulus (G"). In the materials studied, polymers in the transition range or in the rubbery state with Q = 1 and 10, the viscoelastic contribution must be higher than 15% and 50%, respectively, for a 5% limit error in the shear parameters extraction. A criterion for a practical determination of the appropriate viscoelastic regimes is indicated.
Collapse
Affiliation(s)
- A Arnau
- ETSI Telecommunication, Universidad Politecnica de Valencia, Spain.
| | | | | |
Collapse
|
50
|
|